The yellowing and drying of leek tips can be caused by several factors. First, during the early winter germination period, if the concentration of fertilizers or pesticides is too high, it can cause leaf tip burn, leading to dry and damaged leaves. Second, excessive use of urea or nitrate nitrogen can also be a problem. The recommended maximum amount of urea per mu is 12 kg. If applied in excess, ammonia can harm the leaves, while an overabundance of nitrate and ammonium nitrogen may lead to nitrite accumulation, causing nitrous acid damage that results in yellowing and drying of the leaves. You can test the pH of the dew using pH paper to check for acidity levels, which may indicate improper fertilizer application.
Third, if the air circulation in the greenhouse is too strong, especially when temperatures are high, sudden ventilation can shock the plants, causing the leaves to dry out and their tips to turn yellow. Fourth, certain leek varieties such as ferrets, small roots, and winter stalks are more prone to dry tips during summer, fall, and winter. However, this issue is less common in protected cultivation during the winter months, where environmental conditions are more controlled.
To address these issues, it's important to carefully manage fertilizer applications before the growing season begins, ensuring the correct dosage is used to avoid damaging the sprouts. Urea should not exceed 12 kg per mu, and it's advisable to use more organic or humic acid-based fertilizers to promote root development and improve plant health. Additionally, minimize the use of nitrate nitrogen fertilizers whenever possible, as they can contribute to leaf discoloration and drying. By maintaining balanced nutrient levels and proper environmental control, you can significantly reduce the occurrence of yellow and dry tips in your leeks.
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